Coupling for tubes



Jan. 1,1, 1949. J. N. woLFRAM COUPLING FOR TUBES n Filed Deo. 2, 1944 21M mi @TM lPatented Jan. 11, 1949 UNITED vSTATES PATENT oFFicE John Wolfram,l Cleveland, hio, assigner to n The Parker Appliance Company, Cleveland,

Ohio, a corporation of Ohio application December z, 1944, serial No. 566,316

1 The invention relates to, new and useful improvements in a coupling vfor tubes, and more particularly to a coupling where the tube is held A further object of the invention is to provide a coupling for a tubehaving the end portion thereof bent` outwardly to provide a shoulder gripped by the coupling members and thence in- 'wardly at right' angles to the axis of the tube to provide an abutment shoulder for engagement with the sealing gasket. and for limiting the closing movement of the coupling.

A1 claim.. (ci. zas-izo) extension II which projects out'through the nut These and other objects will in' part be obvious and will in part -be hereinafter more fully disclosed.

In the drawings:

Figure '1 is a longitudinal sectional view throu a coupling embodying the improvements with the nut turned onto the body member' with finger tightness;l

Figure 2 is a view similar to Figure l. but showing the coupling completely closed.

The improved coupling includes a body member i having a bore Z'therethrough of substantially the inner diameter of the tube which is to be secured to the coupling. The body member at its inner end terminates in an annular surface 3. The end'portion of the body member is counteri bored to provide a. cylindrical surface 4 and a.

radial surface 5 which inclines to the right as viewed in Figure 1. These two surfaces 4 and 5 form a recess for a vring gasket indicated at 6. The ring' gasket is so dimensioned that it is of slightly larger diameter than the inner diameter of the bore 4 so that when placed in the recess it will be -retained therein by the expansion of the gasket against the wall of the bore 4. This gasket is so dimensioned that it projects beyond the end 3 of the body member. v

Attached to the body member is a nut 1, said nut being connected to the body member by a thread 8 which as shown is on the external surface of the body member. This threaded connection may be otherwise formed. The nut is provided with an 'inwardly extending flange 9.

and along the tube which is clamped to the couplings. adapted to engage the flange on the nut. The tube I3 as shown in Figures 1 and 2 is deformed outwardly to form a bell-shaped portion I4 and then it is turned inwardly as indicated at I5.

The inner end of the inturned portion is substantially in alignment with the inner surface of the tube. This provides a tapered surface I6 at the outer side of the outwardly preformed portion of the tube and this tapered surface is adapted to be engaged by the inner end of the sleeve I0 which is preferably of cylindrical contour as indicated at I8. The inturned portion I5 of the tube has a shoulder or abutment face ,l1 which lies in a plane at right angles to the longitudinal axis of the coupling. The deformable ring gasket 6 is first contacted with by this abutment face I1 of thetube end when the nut is` threaded onto the body member. As shown in Figure'z, the nut has been turned all the-way onto thebody member. This deforms the ring gasket 8 so that it substantially lls the recess between the inner end of the body member and the radial surface 5 thereof. The end of the tube will contact with the body member and limit further closing of the coupling. This will prevent the extrusion of the gasket into the passage through the body member and through the tube.

It will be noted that the tube end is held to the coupling by mechanical features in the coupling members. that is, the flange s of the nut presses against the shoulder I2 of the sleeve and forces the portion I8 of the sleeve into engageend vand this clamps the end of the tube against the end of the body member. At the same time the tube is forced by the nut toward the body member and the gasket will be deformed in its recess which will completely ll the recess and form a liquid-tight joint between the tube and the body member. Any pressure on the line will tend to press the deformable gasket further into the recess and inasmuch as the tubev is clamped against the end of the body member, the recess is closed so that there is no chance for the gasket being forced out of its recess.

It will be noted that there is no deforming of the tube during the clamping of the same to the coupling members. The tube is merely moved forward toward the body member as the nut isturned onto the body member until it is brought into contact with the gasket and then it will deform the gasket which requires only a com- This sleeve has a shoulder I2 which is paratively light turning torque applied to the nut and nally the tube end will contact with the body membe and limit all further closing oi' the coupling.

It is obvious that minor changes in the details of construction may be made without departing from the spirit of the invention as set forth in the l appended claim.

I claim: l

A coupling for tubes having the end thereof bent outwardly to provide a shoulder and thence inwardly into a iiat abutment tace at right angles'to the axis of the tube, comprising a body member. a nut yhaving a thread engagement therewith, a sleeve associated with vsaid nut and adapted atits inner end to engage the preformed shoulder on the tube for clamping the abutment face of the tube against the outer end of the body member, said body member having at its outer end and the inner side thereof a recess, a

lns1-Emmons CITED The following references are of record in the fue of this patent:

UNITED STATES PATENTS Number Name Date 1,580,462 wodru ADI'. 13. 1926 1,604,868

Woodru Oct. 26, 1926 

